Your chargers always available and performing
From commissioning to daily ops, we guarantee the reliability and performance of every charging point. Fast field response, continuous monitoring, no compromises.
A foundation of excellence for every charger
Six performance pillars to maximize your infrastructure's uptime, cut operating costs, and deliver a flawless charging experience.
Commissioning
Charger activation and configuration, charge testing, team training and production rollout.
- Supervisor configuration
- Full charge testing
- Technical documentation
Preventive Maintenance
Scheduled regular servicing to prevent failures and maintain optimal performance.
- Scheduled visits
- Electrical checks
- Firmware updates
Corrective Maintenance
Rapid fault repair with on-site intervention within 4 hours.
- Remote diagnostics
- Rapid intervention
- Spare parts
24/7 Monitoring
Real-time fleet monitoring with automatic alerts on any anomaly.
- Real-time dashboard
- Proactive alerts
- Monthly reports
Fleet Management
Continuous optimisation of your infrastructure to maximise profitability and user experience.
- Usage analysis
- Upgrade recommendations
- Access management
User Support
24/7 technical assistance for your end users via a dedicated hotline.
- 24/7 hotline
- Real-time chat
- Multilingual support
Transformer Maintenance HV/LV
JCSM provides preventive and corrective maintenance for your high and low voltage transformers across France and Belgium. A high-performing charger fleet depends on a reliable power supply.
Our certified technicians service the entire HV/LV chain: switchgear cells, cable compartments, busbars, main distribution boards, oil and dry transformers, capacitor banks and circuit breaker disconnectors.
of charger faults linked to upstream power supply
extended lifespan with preventive maintenance
unplanned outages thanks to continuous monitoring
Our areas of expertise
HV switchgear cells & cable compartments
Oil & dry-type transformers
Main distribution boards & busbars
Circuit breaker disconnectors & fuses
Capacitor banks
Dielectric analysis & thermography
Comprehensive Maintenance Programme
Select the area that applies to you to see the full details of our services
EV Chargers
AC maintenance (3.7-22 kW) & DC (50-350 kW)
EV Chargers
AC maintenance (3.7-22 kW) & DC (50-350 kW)
Commissioning
- •Electrical installation check (NFC 15-100 compliance)
- •Charger setup and configuration
- •AC/DC charge testing and OCPP protocol validation
- •Supervision setup and management system integration
Preventive maintenance
- •General visual inspection (casing, screen, connectors)
- •Cleaning of charging plugs and connectors
- •Torque check on electrical connections
- •RCD and circuit breaker testing
- •Infrared thermography of power components
- •Firmware and embedded software updates
Corrective maintenance
- •Fault diagnosis (error codes, OCPP logs)
- •Component replacement (motherboard, screen, connector, cable)
- •AC/DC power module repair
- •RFID reader and payment system replacement
- •Recommissioning and full functional testing
Connectors & cabling
- •Charging cable condition check (Type 2, CCS, CHAdeMO)
- •Plug locking and retraction mechanism check
- •Worn cable and connector replacement
- •Internal wiring and terminal block inspection
Monitoring & remote management
- •Remote diagnosis via monitoring platform
- •Remote restart and error reset
- •OTA (Over-The-Air) firmware updates
- •Charging session monitoring and real-time alerts
Electrical protection
- •RCD testing (Type A, Type B)
- •Surge protector and overvoltage protection check
- •Earthing check and resistance measurement
- •Phase balancing check (three-phase)
HV/LV Transformers
Switchgear, main distribution boards, oil & dry transformers, circuit breakers
HV/LV Transformers
Switchgear, main distribution boards, oil & dry transformers, circuit breakers
HV switchgear cells
- •Visual inspection (chalking, cracks, heat marks)
- •Dust removal and general cleaning
- •Interlock check
- •Control compartment: switching test and operation check
- •Control mechanism and earthing switch cleaning
- •Earthing control check
- •Electrical auxiliary equipment check
Cable compartment
- •Enclosure visual inspection (chalking, cracks, heat marks)
- •Connection check (torque, chalking, heat marks)
- •Cable inspection (chalking, heat marks)
- •Cable termination check (torque, fixation)
PASA cabinet
- •Cell mechanical interlock check and testing
- •Electrical testing and transfer switch (NSM) check
- •Battery charge level check
Busbars (de-energised)
- •Busbar inspection
- •Torque check (heat marks)
- •Insulator check (chalking, heat marks)
HV substation main distribution board
- •Connection check (torque, chalking, heat marks)
- •Cable and termination check (torque, fixation)
- •LV main circuit breaker operations
- •General cleaning and torque check
- •Earthing and interlock check
- •Transformer protection check
- •Insulation measurement and transformation ratio testing
Oil transformer
- •Dielectric oil sampling and analysis
- •Full visual inspection
- •General cleaning
- •Leak check
- •Connection torque check
Dry transformer
- •Dry air pressure cleaning (dust particle removal)
- •Visual inspection of insulators and conductive parts
- •Electrical connection torque check
- •Earthing continuity check (TIT neutral, metal frames)
- •Earth resistance measurement (value ≤ 1 Ω)
Circuit breaker disconnector (Master Pack)
- •Cleaning and dust removal
- •Moving parts wear inspection
- •Line disconnector cleaning and lubrication
- •Insulator check (chalking, heat marks)
- •Circuit breaker interlock and contact resistance check
- •Plug-in contact inspection (if withdrawable)
HV fuses
- •Visual fuse inspection (chalking, colour, cracks, corrosion)
- •Fixation and signalling check
- •Fuse-blow tripping check
- •Fuse impedance check
- •Replacement if > 10 years (additional quote)
Capacitor bank (option)
- •Cabinet ambient temperature check (< 50 °C)
- •Unbalance current check and protection relay adjustment
- •Varmetric regulator check (cos φ, timing, C/K, steps)
- •Capacitor discharge check after lockout
- •Full cleaning, ventilation dusting and bank cleaning
- •Visual capacitor inspection (leaks, swelling)
- •Capacitance measurement and fuse impedance testing
Transformer dielectric analysis
- •Transformer contamination level measurement
- •Liquid dielectric quality characterisation
- •Internal condition assessment for electrical incident prevention
- •Complete transformer health check for maximum safety
Level 2 main distribution board revision
- •Technician visit and risk identification
- •HV / transformer / LV circuit breaker equipment identification
- •Equipment obsolescence and safety accessories review
- •Fuse check (chalking, colour, cracks, corrosion) and leak testing
- •Renovation and anticipation of age-related degradation
- •Tailored solutions based on HV substation age
Results that speak for themselves
Uptime rate
Response time
Continuous monitoring
Field interventions
Managed Brands - EV Chargers
Certified expertise across all major EV charger brands on the market
Nationwide Coverage
Our certified technicians operate across more than 25 strategic cities to ensure rapid response anywhere in France and Belgium.
OCPP-native operations for the modern charging network
We do not just fix chargers -- we speak their language. Our operations platform is built on deep OCPP expertise, enabling remote diagnostics, proactive alerts, and data-driven maintenance.
OCPP 2.0.1 Compliance
Our team is fully trained on both OCPP 1.6 and the latest OCPP 2.0.1 protocol. We configure, troubleshoot and optimise charger-to-backend communication for any CSMS platform -- ensuring seamless transactions, smart charging profiles, and ISO 15118 Plug & Charge readiness.
- Device model and security event reporting (OCPP 2.0.1)
- Smart charging profiles and load balancing configuration
- Remote firmware updates and configuration key management
- Backend integration troubleshooting (any CSMS)
24/7 Real-Time OCPP Monitoring
Our supervision platform monitors OCPP heartbeats, connector status changes, and error codes around the clock. When a charger goes offline or reports a fault, we know before your users do -- and we act immediately with remote resets, configuration fixes, or pre-dispatched field teams.
- Automated alerts on StatusNotification errors
- Remote reset and unlock commands before dispatch
- 40% of faults resolved remotely without site visit
- Monthly uptime and performance reporting
Multi-brand expertise across 15+ manufacturers
Our technicians hold manufacturer certifications and undergo continuous training. We service the full spectrum of AC and DC hardware, from 7 kW wallboxes to 350 kW ultra-rapid chargers.
Terra AC/DC
Eve Single/Double
Elvi, Troniq
S/C-Series
Pulsar, Supernova
EVlink Pro
eNext, Raption
DC chargers
AC Max, DC City
Green'Up
RTM, PKM
MaxiCharger
European-grade SLA commitments
Our service level agreements are designed to meet the uptime requirements of AFIR-regulated networks and commercial charging operators. Every KPI is contractual, measurable, and reported monthly.
- 4h on-site response in urban zones, 8h nationwide
- Target uptime above 95% per charging point
- Spare parts pre-positioned for critical components
- Monthly reporting with uptime, MTTR, and first-fix rates
Urban response
Uptime target
Remote resolution
Monitoring
Frequently Asked Questions
What types of chargers do you maintain?
We maintain all AC chargers (3.7 to 22 kW) and DC chargers (50 to 350 kW) from leading brands: ABB, Schneider, EVBox, Alfen, Kempower, Tritium and more. We also service the associated HV/LV transformers.
What is your response time?
Our contractual commitment is 4 hours in urban areas and 8 hours in rural areas for critical interventions. Our 24/7 support enables immediate remote diagnostics, resolving 40% of faults without an on-site visit.
Do you offer preventive maintenance?
Yes, our contracts include scheduled preventive visits (quarterly or biannual depending on the contract). We inspect connectors, electrical supply, firmware updates and equipment cleaning.
Do you operate in Belgium?
Yes, we cover mainland France and Belgium (Brussels, Wallonia, Flanders). Our teams are deployed across the territory to ensure fast response times.
Step up to operational excellence today
Our tailored contracts guarantee the uptime, performance and profitability of your EV charging infrastructure. Let us discuss your goals.
Request a personalised audit